Zora Tunic - Allows you to breathe under water. Can be bought in the Zora's Domain shop. Can also be obtained from the Zora King. To get it from the Zora King, as adult Link go into the Ice Cavern at Zora's Fountain (behind the King's throne room) and find a magic blue flame. Catch the magic blue flame in a bottle and return to the frozen King Zora and use it to melt him. Talk to him and he'll give you the tunic.